1851 Great Exhibition: Official Catalogue: Class X.: William Sadd
From Graces Guide
301. SADD, WILLIAM, East Hill, Wandsworth— Designer, Manufacturer, and Proprietor.
Model of an aerial machine, which consists of two revolving wheels for propelling, and a rudder at each end to steer the machine; and two floats to raise or lower it without the aid of ballast. The whole is sustained by two cylindrical balloons, placed horizontally. This constitutes the apparatus, which is said by the exhibitor to be as much under control as a ship on the seas; and that, notwithstanding contrary currents of air, it can be steered in any course that may be indicated, with equal facility.
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